AFAIK server CPUs aren't much different than consumer offerings, and generally more cores = lower clock speeds, and (generally) subsequently leads to lower sing

AFAIK server CPUs aren't much different than consumer offerings, and generally more cores = lower clock speeds, and (generally) subsequently leads to lower single threaded performance. It's highly likely there's a market for it, however I'm doubtful they'd be willing to spec lower-density, higher-performance machines for the few people who would actually take advantage of them. Considering high core count CPUs are becoming the new norm, re-writing or finding software that can take advantage of multiple cores/threads is certainly the way to for maximum performance (where possible, of course)